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Image Tools · Updated October 20, 2026

Image to Base64 Converter

You can turn an image into a Base64 string or a ready-to-paste data URL in your browser, then copy or download the text for CSS, JSON or an email template without uploading the picture.

Runs in your browserFree · No sign-up · No watermark
IMAGE → BASE64Runs in your browser
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Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Works with
IMAGE → BASE64
Processing
In your browser
Max size
Up to 10 MB per image
Price
Free, no account
Updated
October 20, 2026
All Image Tools

About Image to Base64

Base64 turns an image's bytes into text, which is exactly what you need when a system accepts a string but not a file upload: a CSS background, an inline image source, a JSON field, an HTML email template or a database column. This converter reads the image locally with FileReader and writes either the full data URL or the raw Base64 payload, so you can pick the shape the receiving system expects.

The encoded text is usually about a third larger than the original file, which matters for page weight and email size limits. The panel reports the character count before you copy, so an oversized hero image is obvious rather than surprising. SVG input is returned as markup text and works as a data URL, although some systems block SVG data URLs for security reasons.

What this tool does

The details that matter when you use Image to Base64 for real work.

  • Data URL or raw Base64

    Choose the complete data:image/...;base64,... string for HTML and CSS, or only the encoded payload for APIs and JSON fields.

  • JPG, PNG, WebP, GIF and SVG

    Any common web image can be encoded, including animated GIFs and vector SVG files, with the original media type kept in the data URL.

  • Characters and encoded size

    The selected file size, Base64 character count and encoded byte size are shown side by side so you can judge page-weight impact first.

  • Copy or download as text

    Copy the full string to the clipboard, or download it as a .txt file for repositories, email templates and documentation.

  • Encoding stays in the tab

    FileReader encodes the selected file locally. The image and the resulting string never travel over the network.

How to use Image to Base64

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Drop in an image

    Choose a PNG, JPG, WebP, GIF or SVG file up to 10 MB, or drag it onto the picker.

  2. 02

    Pick the output shape

    Keep Data URL when the text goes into HTML or CSS, or pick Raw Base64 for an API request or a JSON value.

  3. 03

    Check the character count

    Read the encoded size under the preview. If the string is enormous, compress or resize the image before using it inline.

  4. 04

    Copy or download the text

    Use the copy button for the clipboard, or download a .txt file that keeps the whole string intact.

How this tool works

Works with
IMAGE → BASE64
Processing
Client-side, in your browser. Nothing is uploaded.
Maximum size
Up to 10 MB per image
Requirements
Chrome, Edge, Firefox or Safari on desktop or mobile

Limitations worth knowing

  • Encoded text is about 33% larger than the source file, so Base64 is a poor fit for large photos and hero images.
  • Only images up to 10 MB are accepted; bigger files should be compressed or resized first.
  • Animated GIFs are encoded byte for byte, but some email clients and CMS fields will not animate data URL GIFs.

Privacy and file handling

The image is read with the browser FileReader API and encoded in memory on your device. It is never uploaded to FormatFlow or a third party, no copy is stored, and closing or refreshing the page discards the file and the generated string.

Read the full privacy policy

Image to Base64 FAQ

Short, direct answers to the questions people ask before using this tool.
When should I use a data URL instead of a normal image file?
A data URL is useful for tiny icons, email templates and documents that must be self-contained, because it removes a separate HTTP request. For normal web pages a separate image file is usually better: it caches once and keeps the HTML small.
Why is my Base64 string bigger than the original file?
Base64 represents every three bytes as four characters, so the encoded text is roughly 33% larger than the binary file. The data URL prefix adds a few more characters on top of that.
Does converting an image to Base64 change its quality?
No. Encoding is a reversible text representation of the exact same bytes; decoding returns a byte-identical file. Resizing or re-compressing the image is what changes quality, and this tool does neither.
Can I paste the result directly into a CSS background?
Yes, use the Data URL option and paste it as background-image: url(data:image/...). Some build tools and minifiers handle very long strings poorly, so keep inline data URLs for small assets.
Is my image uploaded while it is encoded?
No. The file is read with the browser's FileReader API and encoded in memory; it is never sent to FormatFlow or any third party, and no copy is stored after the tab closes.
Why does an SVG data URL not render in some places?
Some applications block SVG data URLs because SVG can contain scripts and external references. If a preview stays blank, use a raster format such as PNG or serve the SVG as a normal file instead.
What is the practical size limit for Base64 in a browser?
The picker accepts files up to 10 MB, which produce around 13 MB of text. Much larger strings become slow to copy and may hit editor or clipboard limits, so compress or resize the image first.

Background reading

Format guides that explain the trade-offs behind Image to Base64.